The 'CascadePackage' package did not load correctly

I just did an update to VS2019(16.9.0) and now I get this message. (actually on two machines). A restart does not resolve the problem.

What is the CascadePackage? Can I just say No to dialogue box and be OK?

Also...the file it mentions to examine...does not exist anymore, nore the directory it was in.

I did find this line in the latest ActivityLog.xml

  <entry>
    <record>894</record>
    <time>2021/03/05 13:52:21.259</time>
    <type>Error</type>
    <source>VisualStudio</source>
    <description>SetSite failed for package [CascadePackage]Source: &apos;System.ComponentModel.Composition&apos; Description: The composition produced multiple composition errors, with 3 root causes. The root causes are provided below. Review the CompositionException.Errors property for more detailed information.&#x000D;&#x000A;&#x000D;&#x000A;1) No exports were found that match the constraint: &#x000A;&#x0009;ContractName&#x0009;Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&#x000A;&#x0009;RequiredTypeIdentity&#x0009;Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: Cannot set import &apos;Microsoft.VisualStudio.Cascade.CascadePackage.JoinWorkspaceCommandHandler (ContractName=&quot;Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&quot;)&apos; on part &apos;Microsoft.VisualStudio.Cascade.CascadePackage&apos;.&#x000D;&#x000A;Element: Microsoft.VisualStudio.Cascade.CascadePackage.JoinWorkspaceCommandHandler (ContractName=&quot;Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&quot;) --&gt;  Microsoft.VisualStudio.Cascade.CascadePackage&#x000D;&#x000A;&#x000D;&#x000A;2) No exports were found that match the constraint: &#x000A;&#x0009;ContractName&#x0009;Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&#x000A;&#x0009;RequiredTypeIdentity&#x0009;Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: Cannot set import &apos;Microsoft.VisualStudio.Cascade.CascadePackage.ShareWorkspaceCommandHandler (ContractName=&quot;Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&quot;)&apos; on part &apos;Microsoft.VisualStudio.Cascade.CascadePackage&apos;.&#x000D;&#x000A;Element: Microsoft.VisualStudio.Cascade.CascadePackage.ShareWorkspaceCommandHandler (ContractName=&quot;Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&quot;) --&gt;  Microsoft.VisualStudio.Cascade.CascadePackage&#x000D;&#x000A;&#x000D;&#x000A;3) No exports were found that match the constraint: &#x000A;&#x0009;ContractName&#x0009;Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&#x000A;&#x0009;RequiredTypeIdentity&#x0009;Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&#x000D;&#x000A;&#x000D;&#x000A;Resulting in: Cannot set import &apos;Microsoft.VisualStudio.Cascade.CascadePackage.ClientService (ContractName=&quot;Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&quot;)&apos; on part &apos;Microsoft.VisualStudio.Cascade.CascadePackage&apos;.&#x000D;&#x000A;Element: Microsoft.VisualStudio.Cascade.CascadePackage.ClientService (ContractName=&quot;Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&quot;) --&gt;  Microsoft.VisualStudio.Cascade.CascadePackage&#x000D;&#x000A;&#x000D;&#x000A;</description>
    <guid>{D86E17D6-7FC7-47F4-9259-21748EDFF93B}</guid>
    <hr>80131500</hr>
    <errorinfo></errorinfo>
  </entry>

Solution 1:

Seem like this was caused by LiveShare. From Visual Studio Developer Community

Just search for

The 'CascadePackage' package did not load correctly

As for my two issues:

On one machine...the error went away by starting VisualStudio.

On another machine I went into Tools->Get Tools and Features...
Click on Individual components search for Live Share. Uncheck it. Restart VS.

Go back into Tools->Get Tools and Features...
Click on Individual components search for Live Share. Check it back.

More about the ActivityLog...
Visual Studio uses a /log option on update. This creates the ActivityLog.xml.
More here /Log (devenv.exe) This is something you can also do yourself.

The description part of the ActivityLog.xml will list where the problems are. Here is an edited breakdown of the original message in the OP.

<entry>
    <record>894</record>
    <time>2021/03/05 13:52:21.259</time>
    <type>Error</type>
    <source>VisualStudio</source>
    <description>SetSite failed for package [CascadePackage]Source: &apos;System.ComponentModel.Composition&apos; 
    Description: The composition produced multiple composition errors, with 3 root causes. 
    The root causes are provided below. 
    Review the CompositionException.Errors property for more detailed information.&#x000D;&#x000A;&#x000D;&#x000A;
    1) No exports were found that match the constraint: &#x000A;&#x0009;
    ContractName&#x0009;Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&#x000A;&#x0009;
    RequiredTypeIdentity&#x0009;Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&#x000D;&#x000A;&#x000D;&#x000A;
    Resulting in: Cannot set import &apos;
    Microsoft.VisualStudio.Cascade.CascadePackage.JoinWorkspaceCommandHandler (ContractName=&quot;
    Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&quot;)&apos; on part &apos;
    Microsoft.VisualStudio.Cascade.CascadePackage&apos;.&#x000D;&#x000A;
    Element: Microsoft.VisualStudio.Cascade.CascadePackage.JoinWorkspaceCommandHandler (ContractName=&quot;
    Microsoft.VisualStudio.Cascade.Commands.IJoinCommandLineHandler&quot;) --&gt;  
    Microsoft.VisualStudio.Cascade.CascadePackage&#x000D;&#x000A;&#x000D;&#x000A;
    2) No exports were found that match the constraint: &#x000A;&#x0009;
    ContractName&#x0009;Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&#x000A;&#x0009;
    RequiredTypeIdentity&#x0009;
    Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&#x000D;&#x000A;&#x000D;&#x000A;
    Resulting in: Cannot set import &apos;
    Microsoft.VisualStudio.Cascade.CascadePackage.ShareWorkspaceCommandHandler (ContractName=&quot;
    Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&quot;)&apos; on part &apos;
    Microsoft.VisualStudio.Cascade.CascadePackage&apos;.&#x000D;&#x000A;
    Element: Microsoft.VisualStudio.Cascade.CascadePackage.ShareWorkspaceCommandHandler (ContractName=&quot;
    Microsoft.VisualStudio.Cascade.Commands.IShareCommandLineHandler&quot;) --&gt;  
    Microsoft.VisualStudio.Cascade.CascadePackage&#x000D;&#x000A;&#x000D;&#x000A;
    3) No exports were found that match the constraint: &#x000A;&#x0009;ContractName&#x0009;
    Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&#x000A;&#x0009;RequiredTypeIdentity&#x0009;
    Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&#x000D;&#x000A;&#x000D;&#x000A;
    Resulting in: Cannot set import &apos;
    Microsoft.VisualStudio.Cascade.CascadePackage.ClientService (ContractName=&quot;
    Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&quot;)&apos; on part &apos;
    Microsoft.VisualStudio.Cascade.CascadePackage&apos;.&#x000D;&#x000A;
    Element: Microsoft.VisualStudio.Cascade.CascadePackage.ClientService (ContractName=&quot;
    Microsoft.VisualStudio.Cascade.Contracts.IVsCascadeClientService&quot;) --&gt;  
    Microsoft.VisualStudio.Cascade.CascadePackage&#x000D;&#x000A;&#x000D;&#x000A;
    </description>
    <guid>{D86E17D6-7FC7-47F4-9259-21748EDFF93B}</guid>
    <hr>80131500</hr>
    <errorinfo></errorinfo>
  </entry>

Solution 2:

To fix this error, please update to Visual Studio 16.9.2 - it has been fixed there. It's also mentioned in the Release Notes:

Fixed an issue causing an error message indicating the CascadePackage did not load correctly